1/8192 the number of (n+2)X3 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A186547

1/8192 the number of (n+2)X3 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =0a(1) =290a(2) =2972a(3) =168200a(4) =3090668a(5) =111188198a(6) =2585394080a(7) =78931270418

External references